Julie Carney, 27

Cofounder, Gardens for HealthJulie Carney's Gardens for Health works in Rwanda, providing patients at public health centers with seeds, tree seedlings, and small livestock. The goal: make agriculture part of the prescription for malnutrition, teaching parents how gardens can provide healthy foods to their children. The group has worked with 1,500 Rwandan families with malnourished children; 71% of kids are now at healthy weights.